They look the same as I've got on mine,bought my K12 with them already on.I am 99% sure you can get the whole kit(front and rear splitters and side skirts) from any Nissan main dealer as I think they were offered as an accessory when you bought a new K12.
I saw the same kits on ebay I think about 18 months ago but don't know if there are any for sale at the moment.good luck!
THE FIRST 30 SECONDS OF LIFE CAN BE DIFFICULT,THE LAST 30 SECONDS AR'NT EXACTLY A BUNDLE OF LAUGHS EITHER.